Regulations & Permits

Use this portal to filter and search for all of our regulatory information.

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

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Adopted rule language (WAC 173-423) 12/27/18

This is adopted rule language for Chapter 173-423 WAC, Low Emission Vehicles.

https://ecology.wa.gov/adopted-rule-language-wac-173-423-12-27-18

Adopted rule language (WAC 173-430) 04/12/19

This is adopted rule language for Chapter 173-430 WAC, Agricultural Burning.

https://ecology.wa.gov/adopted-rule-language-wac-173-430-04-12-19

Adopted rule language (WAC 173-422) 06/02/21

This is adopted rule language for Chapter 173-422 WAC, Motor Vehicle Emission Inspection.

https://ecology.wa.gov/adopted-rule-language-wac-173-422-06-02-21

Adopted rule language (WAC 173-444) 01/06/21

This is adopted rule language for WAC 173-444, Clean Energy Transformation Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-444-01-06-21

Adopted rule language (WAC 173-441) 02/09/22

This is adopted rule language for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.

https://ecology.wa.gov/adopted-rule-language-wac-173-441-02-09-22

Adopted rule language (WAC 173-455) 3-3-23

This is adopted rule language for WAC 173-445, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-3-3-23

Adopted rule language (WAC 173-424) 11-28-22

This is the adopted rule language for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-424-11-28-22

Adopted rule language (WAC 173-423) 12/19/22

This is adopted rule language for WAC 173-423, Clean Vehicles Program.

https://ecology.wa.gov/adopted-rule-language-wac-173-423-12-19-22

Adopted rule language (WAC 173-455) 11-28-22

This is adopted rule language for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-11-28-22

Adopted rule language (WAC 173-423) 11/29/21

This is adopted rule language for WAC 173-423, Clean Vehicles Program.

https://ecology.wa.gov/adopted-rule-language-wac-173-423-11-29-21

Adopted rule language (WAC 173-422A) 06/02/21

This is adopted rule language for Chapter 173-422A WAC, Motor Vehicle Emission Inspection.

https://ecology.wa.gov/adopted-rule-language-wac-173-422a-06-02-21

Adopted rule language (WAC 173-410) 04/23/19

This is adopted rule language for Chapter 173-410 WAC, Sulfite Pulping Mills.

https://ecology.wa.gov/adopted-rule-language-wac-173-410-04-23-19

Adopted rule language (WAC 173-455) 10/25/18

This is adopted rule language for Chapter 173-455, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-10-25-18

Adopted rule language (WAC 173-415) 04/23/19

This is adopted rule language for Chapter 173-415 WAC, Primary Aluminum Plants.

https://ecology.wa.gov/adopted-rule-language-wac-173-415-04-23-19

Adopted rule language (WAC 173-443) 12/10/20

This is adopted rule language for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/adopted-rule-language-wac-173-443-12-10-20

Adopted rule language (WAC 173-460) 11/22/19

This is adopted rule language for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/adopted-rule-language-wac-173-460-11-22-19

Adopted rule language (WAC 173-443) 11-30-23

This is adopted rule language for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs) and Other Fluorinated Greenhouse Gases.

https://ecology.wa.gov/adopted-rule-language-wac-173-443-11-30-23

Adopted rule language (WAC 173-455) 11-30-23

This is adopted rule language for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/adopted-rule-language-wac-173-455-11-30-23

Agenda (WAC 173-400; WAC 173-401) 4-18-24

This is the agenda for the April 18, 2024 stakeholder meeting for Chapter 173-440 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/agenda-wac-173-400;-wac-173-401-4-18-24

Agenda (WAC 173-400; WAC 173-401) 5-15-24

This is the agenda for the May 15, 2024 stakeholder meeting for Chapter 173-440 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/agenda-wac-173-400;-wac-173-401-5-15-24